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In remembrance: September 11th anniversaries

Each year, services are held across the United States to mark the anniversary of the September 11, 2001, attacks.

Mon Sep 05 2011 21:32:12 GMT+0000

A firefighter breaks down after the World Trade Center buildings collapsed on September 11, 2001, when two hijacked airplanes slammed into the buildings [Mario Tama/GALLO/GETTY]

Students from Catholic University in Washington comfort each other during a candlelight vigil marking the first anniversary of attacks at the Capitol Reflecting Pool in 2002 [Photo by Alex Wong/GALLO/GETTY]

A visitor to the temporary memorial at the crash site of Flight 93 writes a message of remembrance in 2003 to the passengers and crew who lost their lives on 9/11. The plane crashed into a rural field from the presumed target of the nation(***)s capital, killing 40 people [Archie Carpenter/GALLO/GETTY]

Mourners hold up signs with photos of loved ones at (***)Ground Zero(***) in New York during a ceremony in 2004 marking the third anniversary of the attacks [Stephen Chernin/GALLO/GETTY]

A US soldiers prays in 2005 at Baghram Air Field in Afghanistan during a ceremony marking the fourth anniversary of the 9/11 attacks. Military officers lauded the soldiers(***) sacrifice serving long tours of duty in Afghanistan after the US invasion in 2001 [John Moore/GALLO/GETTY]

Marine One, carrying then-President George Bush, leaves the crash site of Flight 93 after speaking to the families of the 40 victims at a memorial site in Shanksville, Pennsylvania in 2006 [Jeff Swensen/GALLO/GETTY]

A man holds a photo of New York City firefighter Lt John P Napolitano during a 2007 ceremony in New York commemorating the 9/11 attacks [John O(***)Boyle-Pool/GALLO/GETTY]

Then-Democratic US presidential nominee Senator Barack Obama and Republican US presidential nominee Senator John McCain greet family of the victims of 9/11 as they visit (***)Ground Zero(***) on the seventh anniversary of the 9/11 terrorist attacks in 2008 in New York [Chad Rachman-Pool/GALLO/GETTY]

Firefighters and police officers gather at the reflecting pool as they pay their respects at (***)Ground Zero(***) during a 9/11 memorial ceremony in 2009 in New York City [David Handschuh-Pool/GALLO/GETTY]

People look at the 9/11 (***)Tribute in Light(***) in downtown Manhattan from the Brooklyn borough of New York City in 2010[Chris Hondros/GALLO/GETTY]